Trait BlockDevice 

pub trait BlockDevice:
    Send
    + Sync
    + Any {
    // Required methods
    fn read_block(&self, block_id: usize, buf: &mut [u8]);
    fn write_block(&self, block_id: usize, buf: &[u8]);
}

教程说明： 这是 EasyFS 与具体硬件/驱动之间的最小抽象边界。 文件系统只依赖“按块读写”，不关心块设备底层是 virtio、内存盘还是其他介质。 Trait for block devices which reads and writes data in the unit of blocks

Required Methods

fn read_block(&self, block_id: usize, buf: &mut [u8])

Read data form block to buffer

fn write_block(&self, block_id: usize, buf: &[u8])

Write data from buffer to block

Implementors